α－蒎烯与乙酸催化酯化合成乙酸正龙脑酯

STUDY ON CATALYTIC ESTERIFICATION OF α-PINENE WITH ACETIC ACID

考察了催化剂、反应条件对α－蒎烯与乙酸反应合成乙酸正龙脑酯的影响．结果表明碳正离子的形成速率决定于酸的种类、浓度及强度，是副反应α－蒎烯异构化的主要因素而含硼催化剂具有稳定碳正离子的作用，增加较弱亲核试剂羟基与碳正离子发生酯化反应的机会，从而提高了乙酸正龙脑酯的收率．在自制含硼固体酸催化剂上，酯化率为４９．４％．其中乙酸正龙脑酯占６５％．选择性为３２．５％取得了从α－蒎烯直接合成乙酸正龙脑酯的较佳结果．

The direct addition esterification of α -cpinene with acetic acid over containing-boric-solid-acid catalyst,which is in favor of formation of L-bornyl acetate was studied.With the increase of reaction temperature, acetic acid: a-pinene(male ratio),no water, the yield of isomerization decreases, esterification increases. In the optimum conditions, the conversion of α -pinene is 99.0%,the seletivity of L-bornyl acetate is 32.5%.